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As far as I know, it has never happened, with a few very insignificant exceptions.
Liberty Island, home of the Statue of Liberty, was New Jersey, but was ceded to New York when the statue was built.
The Mississippi River has changed course many times since states were established using the river as the boundary. The boundaries remain exactly where they were before, with the main channel of the river now cutting parts of some states leaving, for example, a lot of Mississippi on the west side of the river.
States that are supposed to have straight line borders don't -- surveying methods in those days left a lot to be desired, and now state lines run crooked, where the old surveyors put them. Once a piece of land was thought to be in a certain state, it stays in that statem even if there is a change in the channel of a river or in a more modern survey line.
I know that there have been some disputed land on borders of states as more reliable and sophisticated technologies have established that people actually live in a different state than they thought they did.
The Missouri River has also changed course over the years d/t flooding, and there is a part of Iowa that is basically an island surrounded by Nebraska.
I don't think Upper Michigan would want to be part of Wi, there are some however who seek their own state. They are not in the majority however so that one will be a tough sell. Here in Tennessee we have the state of Georgia trying to steal a small part of our state for water access to the Tennessee river. There is a 200 year old survey dispute involved here and they are threatening to take it through the federal courts. I would hope something like that is not taken seriously by the courts but I guess you never know. Minnesota has an issue as well on the Canadian border with a small part of Mn which is disconnected from MN and surrounded by Ontario. Some of those people want to join Ontario Canada, I can see their point.
Yes I forgot about that one, but technically only Ohio was a state in that conflict. Michigan was still a territory fighting for that thin strip of land. That incident is a very interesting part of the history of the Midwest. Michigan and Ohio still have a deep seated conflict with each other that may go back to that era. The people of those two states trade barbs with each other regulary and the conflict may be deeper than the college football field. Its the only instance where arms were actually taken up between two states over a border conflict that I am aware of.
Couple of weird things in the lower, western corner of MA (with CT and NY), though not exactly "modern." And, of course, ME used to be part of MA.
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